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Efficient DFT/DCT Computation for OFDM in Cognitive Radio System  

Chen, Zhu (Chonbuk National University)
Kim, Jeong-Ki (Chonbuk National University)
Yan, Yi-Er (Chonbuk National University)
Lee, Moon-Ho (Chonbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.2, 2008 , pp. 97-102 More about this Journal
Abstract
In this paper, we address the OFDM based on DFT or DCT in Cognitive Radio system. An adaptive OFDM based on DFT or DCT in Cognitive Radio system has the capacity to nullify individual carriers to avoid interference to the licensed users. Therefore, there could be a considerably large number of zero-valued inputs/outputs for the IDFT/DFT or IDCT/DCT on the OFDM transceiver. Hence, the standard methods of DFT and DCT are no longer efficient due to the wasted operations on zero. Based on this observation, we present a transform decomposition on two dimensional(2-D) systolic array for IDFT/DFT and IDCT/DCT, this algorithm can achieve an efficient computation for OFDM in Cognitive Radio system
Keywords
DCT; DFT; OFDM; Cognitive Radio;
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